Alaska CDL — General Knowledge practice
Alaska CDL — General Knowledge: Alcohol & Drugs practice test
Blood alcohol limits, zero-tolerance and implied-consent laws, and how alcohol and drugs — legal or not — affect your driving.
Content reviewed against official driver handbooks · August 12, 2026
13 questions · pass with 10 correct. You get instant feedback and an explanation after every answer.
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12 sample Alcohol & Drugs questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
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1. On the manual's table of BAC effects, what is listed at a BAC of .50?
Correct answer: Breathing stops and many die
The last row of the table, .50, is where breathing stops and many people die. The mild effects in the other choices belong to much lower levels.
Source: Alaska Commercial Driver License Manual — Section 2.22.2, Other Drugs (Effects Of Increasing Blood Alcohol Content)
2. On the manual's table of BAC effects, which level is labeled the drunk driving limit, with definite impairment in coordination and judgment?
Correct answer: .08
The table marks .08 as the drunk driving limit. A commercial driver is held to a much lower figure, since operating a CMV is illegal at .04.
Source: Alaska Commercial Driver License Manual — Section 2.22.2, Other Drugs (Effects Of Increasing Blood Alcohol Content)
3. What is the manual's basic rule for a driver who is too sick to handle a motor vehicle safely?
Correct answer: Do not drive at all
If illness leaves you unable to drive safely, the rule is that you must not drive. The only allowance is reaching the nearest safe stopping place in an emergency.
Source: Alaska Commercial Driver License Manual — Section 2.22.3, Illness
4. The driver ahead stops at a green light, then drifts from one side of the lane to the other. According to the manual, what do these clues suggest?
Correct answer: The driver may be impaired by sleepiness, alcohol, drugs, or illness
Stopping at the wrong time and weaving or drifting are listed among the clues to an impaired driver — one who is sleepy, has had too much to drink, is on drugs, or is ill.
Source: Alaska Commercial Driver License Manual — Section 2.8.3, Drivers Who Are Hazards
5. Besides slowing your reaction to hazards, fatigue causes errors related to which two things?
Correct answer: Speed and distance
The manual says fatigue produces mistakes in judging speed and distance, raises crash risk, and weakens your ability to make critical decisions.
Source: Alaska Commercial Driver License Manual — Section 2.11.2, Driver Factors
6. According to the manual, what is the only safe cure when you are drowsy behind the wheel?
Correct answer: Getting off the road and getting some sleep
The manual is blunt: if you are drowsy, the one safe cure is to leave the road and sleep. Tricks that seem to perk you up do not make you alert.
Source: Alaska Commercial Driver License Manual — Section 2.11.2, Driver Factors
7. How does the manual define fatigue?
Correct answer: Physical or mental tiredness that can come from strain, repetitive tasks, illness, or too little sleep
Fatigue is described as being physically or mentally tired. Strain, repetitive tasks, illness, or a lack of sleep can all bring it on.
Source: Alaska Commercial Driver License Manual — Section 2.11.2, Driver Factors
8. Under Alaska's implied consent section, what kind of sample may a law enforcement officer ask a CMV driver for?
Correct answer: A breath sample
Alaska's manual says that by driving a CMV you have already agreed to a breath test for alcohol, and the implied consent law lets officers request a breath sample.
Source: Alaska Commercial Driver License Manual — Section 1, Implied Consent
9. What does the manual say about people's ability to tell when they are about to fall asleep at the wheel?
Correct answer: Many people cannot tell if or when it is about to happen
The manual warns that many people can't tell whether or when sleep is about to overtake them, which is why it lists outward warning signs to watch for.
Source: Alaska Commercial Driver License Manual — Section 2.11.2, Driver Factors
10. Do the on-duty drug rules described in the manual reach legal, non-prescription products?
Correct answer: Yes, if the product makes the driver drowsy or otherwise unsafe to drive
The rules bar being under the influence of any substance that can make a driver unsafe. The manual says this can include prescription and over-the-counter drugs that cause drowsiness or otherwise affect safe driving.
Source: Alaska Commercial Driver License Manual — Section 2.22.2, Other Drugs
11. On Alaska's disqualification list, how is refusing a chemical test ('Refusal') classified?
Correct answer: As a major disqualifying offense, alongside DUI
Refusal sits on the major disqualifying offenses list right after DUI. A first major offense costs one year of commercial driving privileges and a second brings a lifetime disqualification.
Source: Alaska Commercial Driver License Manual — Alaska Motor Carrier Safety Improvement Act
12. You are tired but only an hour from your destination. What does the manual say about trying to 'push on'?
Correct answer: It is much riskier than most drivers realize and a leading cause of deadly crashes
Pushing on when tired is described as much more dangerous than drivers tend to believe, and as a major cause of fatal accidents. The advice is to stop and sleep or take a short nap.
Source: Alaska Commercial Driver License Manual — Section 2.11.2, Driver Factors
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